Problems with 1999 Chevy Silverado 1500 (5.3 Litre V8) Heater Switch?

I

imported_MommaM

New member
No output when switched to setting 4 or 5. Lower settings work just fine. I have replaced the resister switch and tried a new control switch. Still does not work. I also replaced the cab air filters. Any suggestions ??
 
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